1 140 



PROTEIN METABOLISM 



[PT. Ill 



Table 163. Quantitative Data for Nitrogen Partition in Urine (cont.^ 



Nitrogen Partition in % of the total 

 nitrogen excreted 



* It has been suggested that this extraordinary nitrogen partition may be an adaptation; trimethyl- 

 amine as an odorous substance being used to attract the prey. Grollmann's figures apply only to the 

 product of the kidneys and do not include that of the gills. 



t Fishes were found by H. W. Smith to excrete 6-10 times as much nitrogen through the gills 

 as through the kidneys : the former dealt with the readily diffusible end products and the latter with 

 the rest. According to Delaunay, Selachians excrete mostly urea with little ammonia and teleosteans 

 mostly ammonia with little urea. 



X In these cases the ammonia present was calculated to be just sufficient to combine with the uric 

 acid as ammonium urate. 



